Implements ActivityPub federation servers in TypeScript using Fedify dispatchers and listeners.
npx skills add https://github.com/fedify-dev/fedify --skill fedify
Please help me install this Agent Skill. Skill: fedify Source: https://github.com/fedify-dev/fedify/tree/main/claude-plugin/skills/fedify Command: npx skills add https://github.com/fedify-dev/fedify --skill fedify
Building a federated server that speaks ActivityPub involves HTTP Signatures, WebFinger, NodeInfo, JSON-LD vocabularies, delivery queues, and key management. This Skill guides the AI to write correct Fedify-based TypeScript code instead of hand-rolling protocol endpoints or misusing the framework's APIs.
Federation builder pattern, actor/inbox/outbox/collection dispatchers, and inbox listeners with correct URI templates and async semantics.@fedify/<framework> package for Hono, Express, Next.js, Nuxt, Fastify, Koa, NestJS, Astro, SvelteKit, Fresh, h3, Elysia, or Cloudflare Workers.KvStore and MessageQueue adapters, key pair management, LogTape logging, OpenTelemetry tracing, the fedify CLI, and a checklist of common mistakes such as missing queues, SSRF guard disabling, and reverse-proxy origin issues.Follow and Create, and configure a production message queue.Use the fedify skill to create an ActivityPub server with Hono that exposes an actor, an inbox handling Follow activities, and a Postgres-backed queue.
High-intent search queries and answers about installing and using this skill.
Create a Federation object with createFederationBuilder or createFederation, register actor and inbox dispatchers, then mount it through the @fedify/<framework> integration package for your web framework. Fedify serves WebFinger and NodeInfo endpoints automatically.
Call setInboxListeners on the federation builder and chain .on(Follow, handler) to register a listener for that activity class. Activity types without a registered listener receive HTTP 202 and are logged as unsupported, so add a catch-all on the base Activity class if needed.
Yes, Fedify provides dedicated integration packages such as @fedify/express, @fedify/next, and @fedify/cfworkers, plus Hono, Fastify, Koa, NestJS, Nuxt, Astro, SvelteKit, Fresh, h3, and Elysia. On Cloudflare Workers, build the Federation inside the request handler using the builder pattern.
Fedify reads request.url, so behind a reverse proxy or tunnel it mints URIs from the internal origin. Fix it by setting FederationOptions.origin to the canonical URL or by processing X-Forwarded headers with x-forwarded-fetch before requests reach Fedify.
Fedify defines KvStore and MessageQueue interfaces with adapters for SQLite, Postgres, MySQL, Redis, AMQP, Deno KV, and Cloudflare Workers. MemoryKvStore is only suitable for development, and production deployments must configure a real queue for reliable outgoing delivery.
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